Extraction undercut for flanged bits

Details Extraction undercut for flanged bits Extraction undercut for flanged bits

1993-04-26

1994-12-20

Bagnell, David J.

Mining or in situ disintegration of hard material

Cutter tooth or tooth head

Tooth mounted on helical head portion or head with helical...

299 91, E21C 3518

Patent

active

053741110

ABSTRACT:
A cutting bit including a conical nose and an integral depending cylindrical shank. The conical nose includes a tip having a hard wear resistant insert and a flange positioned between the tip and the shank and having a diameter greater than the shank. The flange has a planar underside including at least one undercut extending radially inward from the exterior peripheral surface of the flange to provide in cooperation with the face of a cutting bit block a resistance surface for insertion of a tine of a cutting bit removal tool.

REFERENCES:
patent: 3268260 (1966-08-01), Snipe
patent: 4149753 (1979-04-01), Stoltz et al.
patent: 4251109 (1981-02-01), Roepke
patent: 4298233 (1981-11-01), Elfgen
patent: 4736533 (1988-04-01), May et al.
patent: 4938538 (1990-07-01), Larsson et al.
patent: 5018793 (1991-05-01), Den Besten

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